Based on Table J, which ionic equation represents a spontaneous reaction that can occur in a voltaic cell?

NY Regents Chemistry Exam August 2023 Question 47

47 Based on Table J, which ionic equation represents a spontaneous reaction that can occur in a voltaic cell?

Based on Table J, which ionic equation represents a spontaneous reaction that can occur in a voltaic cell?

Solution: Table J presents most active and least active metals on the left side. Most active metals are located at the top of the table.Metals that are more active will be able to replace metals below them from compounds. For example, Li is more active than K and can replace it, Li+ KCl --> LiCl + K. Most active metals are also most easily oxidized. On Table J, Mg is higher than Fe and should be able oxidized. In choice 4, Mg goes from Mg(s) to Mg^2+ which means it is losing electrons and getting oxidized. Choice 4 is correct.

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